Newham et al. confirmed their theory that the degree to which tissue is lengthened during eccentric contractions will alter the damage caused to the skeletal muscle. Therefore, exercises intending to rapidly adapt tissue can be done in a controlled environment where the degree of displacement from the shortened position is initially small (25% or < of active ROM) in order to greatly reduce the amount of muscle damage caused while still achieving the desired adaptation. Deficits in active ROM that are not structurally driven are an indicator of agonist weakness (Cheng and Rice, 2013.) Therefore, performing exercises that are aided through the concentric phase and only displaced through a predetermined joint angle (based on a particular resistance strategy) is indicative of the safest method for rapidly improving the contractibility of both agonists and antagonists and thereby improving active joint range.